Percussion-fuse.



S. KRUK.

PERCUSSION FUSE.' APPLICATION FILED mm. H. 1917.

L23Ql {4. Patented July P0, 1917.

a'wuewwoz y fgzzz? sesame sylvania, have invented-certain new and use- I ful Improvements.inPercussion-Fuses and 1 I dop elaresli-e renewingbe full, clear,

exaict description-of'lthe invention, such 1 as wi]l 'enable*othefrs skilled in the art to v detail the operative position;

{it appertainsfto make and use the m M013... v

, This-invention relates to new and useful improvements in fusesfor dynamite charges used in blasting, andmore particularly to theclas's of fuse known aspgrcussion fuses,

and-theprimar'y objectof the invention is to provide a fuse of thischaracter :which may be safely transported, handled, and used.

'Anotherobject of-theinvention is to provides. deviceof this character-which is simple and durable in construction, inexpensive to manufacture, and one which will be very' view, 'my. invention consists of the novel fea: tures of construction, combination and arrangement of parts which will be herein referred to and more particularly pointed out in the specification andclaims.

In the accompanying drawings Figure 1 is aside elevation of my improved form of fuse, showing the same in Fig. 2 is a central the fuse; M

. Fig.3 is Fig. 2; Fig. 4 Fig.2; 4 F Fig.- 5 is a cross section on the line 5--5 of ig.2; -l r.v. H, giggfiis a detail view of the firingpin; Fig. 7 is a; side elevation of the fuse, parts thereof'being broken away and showing in a section on the "line of is a cross section on the line 4.4 of

casin lnlescribing my invention, 1* shall refer to thedrawingsiniwhich similar reference characters" "designate corresponding parts throughout the several viewsy The numeral- 1 designates the casing ofthe'fuse which is substantiallytubular and "which: is con-' tracted toward one end The largeror upp a its lower end With these and numerous other objects in vertical section through pull wire connectionwiththe fuse site ctri nn; PENNSYLVANIA.

Patented July 10, 1917.

a med refi er ii; 191?. Serial No. 141,864.

per end of the casing is provided with a cap or closure 2, which is firmly secured thereto by soldering 2, or any other desired means The other end of the pin is disposed adjacent theclosed end of the casing. The other end of the pin is pointed and is provided with spurs 4 thereon to insure its operation. The cap 2 is provided with a central opening 5 through which the upper end of the firing pin is positioned, when said his operatively disposed. The pin 4; is ormed with a I stop member 7 thereon intermediate its ends which preferably comprises an annular projecting ring, and surrounding the upper end of'the pin is a coil spring 6 which has ositioned in a washer 7 which is adapted to e positioned against the stop ring 7 as clearly shown in Fig. 2 of the drawings. The upper end of the coil spring -6 is adapted to normally, when released, be positioned against the cap 2 at this end of v.the casing. However, when the spring is contractedflthis end of the same will be positioned beneath the upper end of the pin, in a manner to be; hereinafter more fully described. j

Intermediate the ends of the casing is p0- sitioned a partition 8 having a centrally disposed guide opening disposed therein, through which the lower or front portion of the pi'n4 isiadapted to slide. When the firing pin 4 is in retracted or operative position the stop member 7 on the same is positioned a short-distance fromthe partition 8, and when the pinis released, the same will be guided in its movement bythe partition. In the front end of the casing 1 is an explosive cap 11 formed of some ,detonating material such as fulminate, dynamite, nitro-glycerin or other explosive com osition,"suitable for eflecting the firing o a blasting charge.

This cap 11 is disposed directly in the path pierces the same. The inner end of. the cap j ected, has positioned thereon a priming cap 11', such as 1s 00111111011 in devices of this and the "lower end 3 of the casing is left.

character. Owing to the fact that the forward or lower end ofthe casin' '1 is contracted, the explosive cap will e securely positioned therein. v r h Projecting. through an opening 12 ad acent the edge of the cap 2 at the upper end of the casing 1, isa pull wire 13. This pull wire has its inner end extending ashort-distance within the casing 1 and is bent to form a hook 14, said hook being adapted to be positioned through the opening 5 at the upper end of the that surrounds the up er end of sai pin. The extremity of the l fooked portion lL-of the pull wire is adapted to be positioned in an opening 15 in the side. of the casing 1, this opening being preferably formed by coactmg notches in the edge of the cap 2, and upper edge of the casing. When the hooked portion .14 of the pull wire is positioned through the upper end of the pin, the coil spring is compressed, and the upper portion of the same will rest against the wire. The firing pin 4: is lifted or contracted to the position shown in Fig. 2 of the drawings to enable the hook' to pass through the upper end of the same and when inthis position, it will be held retracted against the tension of the coil spring.

In operation, when the various parts of the fuse are assembled as shown in Fig. 2 of the drawings, it will be seen that the firing pin is retracted against the tension of the coil spring, which will exert a constant forward pressure on the same, and also a tension against the hooked portion 14 of the pull wire. However, this wire is of sufficient strength to normally hold the pin lifted or retracted, and thesaid hooked portion is additionally strengthened by having its extremity disposed in the opening through the side of the casing. When in this position, the pointed lower or forward end of the firing pin will be spaced a short distance above the explosive cap 11 in the open end of the casing.

Tooperate the fuse when the parts are in' forward movement. The partition 8 forms a guide for'the forward movenient of the pin, so that it will strikesquarely on the ,primer'that is secured to the inner face of the'explosive cap.

pin, when said pin is re-" tracted against the tenslon of the coil s ring' As is usual in devices of this'character, the pull wire is ,tamped down, and the same is operated by means of a long rope, cable,

whereby the fuse mayybej .fired when the operator, is ata safe distance fromthe blast ing-charge' The hooked member, when positioned. through the opening in the; upper 'end bf the. firing pin, will form a, os tlve lockforthe contractedfspring' and't e out-,

ward' tension of this spring exerted on the hooked portion will likewlse securely hold thesame within the casing and prevent the fuse from being fired prematurely. The tension. of the 0011 spring is not suflicient to I straighten out the hook, but rather tends to lock the same in position, so that it takes considerable outward pullon the wire 13to release the parts. If desired, the extre 't of the'hooked portion is disposed throug the side of the casing adjacent the upper edge ofthe same and may be soldered there to when the vcap is soldered to said casing.

This will form an additional securing means to prevent the hook from becoming acci-' dentally disengaged from the retracted pin.

From the foregoing descri tion of the construction and operation 0 my improved fuse, the manner of applyin the same'to use, and the o 'eration thereo will be readilyunderstoo and it will be seen that I have provided a; simple and elficient device of thls character for carrying out the objects of the invention. 7

I claim 1. A device of the class described comprising a tubular casing having one end closed, an explosive cap disposed in the open end of said casing, a firing pin ositioned longitudinally in. the casing and aving an openinglin its upper end, a pull wire extending a s ort distance through the closed end of the casing, a hook'on the inner end of r i said wire adapted to pass through the opening in the upper end of the fir ng pin and having its extremity positioned in the side of the casing, said hook being releasable wardly upon release of the same from the pull wire to explode the cap.

2. A device of the class described compris ing a tubular casing having one end closed, an explosive. cap disposed in the open end of said casing, a firing pin positioned longitudinally in the casing and having an opening in its upper end, a coil spring surrounding the upper end of said pin, a stop on the pin adapted to engage the lower end. of the spring, a partition adjacent the cap in the open end of the casing having a guide opening therethrough in which the pin is positioned, a pull wire extending a short distance through the closed end of the casing, a hook on the inner end of said wire adapted to pass through the opening in the upper sesame end of the filing pin when said pin is retractedagainst the tension of the coil spring, said hook having its extremity positioned in the side of the casing, and the hook being releasable upon the outward movement of the wardly to explode the cap.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

STANLEY KRU'K. Witnesses:

OHRIsT Burmnwon'rn, W -WA P a 

